<template>
  <div>
    <span v-for="(val, index) in arr" :key="index">
      <input type="checkbox"  v-model="arr2" :value="val"/>
      <span>{{val}}</span>
    </span>
    <p>你选中的元素,累加的值和为:{{all}}</p>
  </div>
</template>

<script>
export default {
  data() {
    return {
      arr: [9, 15, 19, 25, 29, 31, 48, 57, 62, 79, 87],
      arr2:[]
    };
  },
  computed: {
    all(){
     return this.arr2.reduce( (sum,val) => sum += val,0)
    }
  }
};
</script>

<style>
</style>